摘要
可拓案例推理是将可拓学与案例推理结合后形成的一种知识推理方法.首先介绍了可拓案例的复合元表示,并重点给出了区间型故障征兆的相似度计算方法.然后分析了可拓案例推理过程,在可拓案例检索中,采用了粗糙集方法确定故障征兆权重,并提出规则引导的检索策略;在可拓案例重用中,采用可拓传导变换实现了针对不同检索结果的可拓案例重用;在可拓案例修改中,采用可拓增删变换完成了对重用可拓案例的故障征兆和权重的增删;在可拓案例保存中,讨论了对修改可拓案例进行保存的添加、删除和替换3种方式.最后通过应用案例说明采用该方法进行故障诊断的过程,并对可拓案例检索的时间复杂度进行分析,将本文提出的检索策略与全局检索策略进行比较,结果表明采用本文提出的检索策略可以提高检索效率,加快诊断速度.
Extension case-based reasoning is a kind of knowledge reasoning method which is the combination of the extenics and case-based reasoning. Firstly,the representation of extension case using compound element was introduced,and the similarity computing method of fault symptom with interval value was given.Secondly,the reasoning process of extension case was analyzed; in the retrieve of extension cases,rough set method was adopted to confirm weight of fault symptom,and search strategy guided by rules was proposed; in the reuse of extension cases,conductive transformation was adopted to fulfill the reuse of extension case according to different search results; in the revise of extension cases,increasing and decreasing transform were adopted to add or delete fault symptoms of reused extension case and change their weight; in the retain of extension cases,three retain modes of revised extension case were discussed,including adding,deleting and replacing. Thirdly,the fault diagnosis process of this method was explained by an application case,and the time complexity of extension case retrieve was analyzed. By the comparison of the proposed search strategy and global search strategy,it is known that using the proposed search strategy can increase search efficiency and improve diagnosis speed.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2015年第11期2124-2130,共7页
Journal of Beijing University of Aeronautics and Astronautics
基金
总装武器装备预研基金(9140A27020214JB14436)
"泰山学者"建设工程专项经费
关键词
可拓学
案例推理
案例检索
故障诊断
可拓变换
extenics
case-based reasoning
case retrieve
fault diagnosis
extension transformation
